CN115229313B

CN115229313B - Clamping device for underwater welding

Info

Publication number: CN115229313B
Application number: CN202210871531.2A
Authority: CN
Inventors: 缪建华; 宋黎菁; 吴春晖; 洪符林
Original assignee: Changzhou Vocational Institute of Textile and Garment
Current assignee: Changzhou Vocational Institute of Textile and Garment
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2023-04-14
Anticipated expiration: 2042-07-22
Also published as: CN115229313A

Abstract

The invention discloses a clamping device for underwater welding, and relates to the technical field of welding auxiliary equipment. Including last casing, lower casing, seal assembly, coupling assembling and supporting component, the both ends of going up casing and lower casing all are provided with seal assembly, go up and be provided with coupling assembling between casing and the lower casing, the below of casing is provided with supporting component down. According to the invention, the upper shell and the lower shell are arranged and matched to form a closed cavity, so that the pipeline welding position can be sealed, and underwater welding can be carried out in a dry environment.

Description

Clamping device for underwater welding

Technical Field

The invention relates to the technical field of welding auxiliary equipment, in particular to a clamping device for underwater welding.

Background

Underwater welding has the problems that the welding process becomes more complicated due to the presence of water, various land welding does not have, and the underwater welding methods which are applied and researched by countries in the world are various, and arc welding is more mature. With the development of underwater welding technology, besides the common wet underwater welding, local dry underwater welding and dry underwater welding, some new underwater welding methods appear. However, from the prospect of ocean development in various countries, the research on underwater welding is far from being suitable for the requirement of situation development. Therefore, it would be a significant task to enhance this area of research, whether for the present or future.

In the prior art, when components such as pipelines and the like are welded underwater, a wet underwater welding mode is generally adopted, but the problems of uneven welding seams and the like are easily caused due to the fact that welding spots are cooled too fast in the wet underwater welding. Therefore, it is necessary to provide a clamping device for underwater welding to solve the above problems.

Disclosure of Invention

In view of the above problems in the prior art, an object of an embodiment of the present invention is to provide a clamping device for underwater welding, which can perform underwater welding in a dry environment.

In order to achieve the purpose, the invention adopts the technical scheme that: a clamping device for underwater welding comprises an upper shell, a lower shell, a sealing assembly, a connecting assembly and a supporting assembly, wherein the sealing assembly is arranged at each of two ends of the upper shell and the lower shell, the connecting assembly is arranged between the upper shell and the lower shell, the supporting assembly is arranged below the lower shell, the upper shell comprises an upper movable cover, the upper connecting cover is fixedly connected to each of two ends of the upper movable cover, the upper connecting cover is of a semicircular structure, convex strips of an arc-shaped structure are fixedly connected to the inner side of the upper connecting cover, a sealing gasket is connected to the lower surface of the upper movable cover in an adhesive manner, a fixing cover is embedded in the middle of the upper movable cover, air exchange pipes are fixedly connected to each of two ends of the fixing cover, an air inlet cover is fixedly connected to the bottom end of each air exchange pipe, an air pump is fixedly connected to the middle of the top end of the upper movable cover, and a one-way valve is fixedly connected to the output end of the air pump, the top end of the check valve is fixedly connected with an exhaust hood, the middle part of the outer side of the upper movable hood is fixedly connected with a gas tank, the output end of the gas tank is fixedly connected with a connecting pipe, the middle parts of the two sides of the fixed hood are fixedly connected with gas outlet hoods, one end of the connecting pipe is fixedly connected with the gas outlet hoods, the lower shell comprises a lower movable hood, the two ends of the lower movable hood are fixedly connected with lower connecting hoods, the lower connecting hoods are arranged in a semicircular structure and are matched with the upper connecting hoods, the middle part of the bottom end of the lower movable hood is embedded with a water guide hood, the upper surface of the water guide hood is provided with a plurality of water guide holes, the top ends of the two sides of the water guide hood are provided with water guide grooves, the middle part of the bottom end of the water guide hood is fixedly connected with a water suction pump, and the sealing assembly comprises two symmetrically distributed outer sealing rings and two symmetrically distributed inner sealing rings, the utility model discloses a sealing device, including internal seal ring, coupling assembling, movable frame, supporting component, support frame, internal seal ring, coupling assembling, connecting block, two sets of symmetric distribution's connecting block, it is two sets of the connecting block is located one side both ends of last movable cover and lower movable cover respectively, one side fixedly connected with spliced pole of connecting block, the outside of spliced pole is cup jointed and is connected with the movable frame, the movable frame sets up to the arc structure, the extrados middle part fixedly connected with extension board of movable frame, two extend the connecting rod of two symmetric distributions of one side fixedly connected with that the board is close to each other, the supporting component includes four supporting shoes that are rectangular array and distributes, four the supporting shoe is located the below four corners department of movable cover down respectively, the below of supporting shoe is provided with the support frame, the support frame sets up to "U" shape structure, the bottom swing joint of round pin axle and supporting shoe is passed through on the top of support frame.

Furthermore, the bottom middle part of fixed cover is inlayed and is had the illumination lamp plate, the outside middle part of going up the movable cover is inlayed and is had the observation window, the material of observation window is toughened glass, the aspiration pump sets up to waterproof air pump.

Further, the outside of activity cover is inlayed and is had two symmetric distribution's operating gloves down, operating gloves sets up to withstand voltage gloves, the upper surface of activity cover is provided with the sealing washer with sealed looks adaptation down.

Furthermore, the outer side of the inner sealing ring is fixedly connected with a sliding block, the sliding block is of a semicircular structure, the cross section of the sliding block is of a T-shaped structure, the inner side of the outer sealing ring is provided with a sliding groove, and the sliding block is located in the sliding groove.

Further, the spacing groove of arc structure is seted up to the inboard of external seal ring, the outside fixedly connected with stopper of interior sealing ring, the stopper is located the spacing inslot, the gasket of the outside fixedly connected with arc structure of interior sealing ring, the recess with sand grip looks adaptation is seted up in the outside of external seal ring, the recess sets up to the arc structure.

Further, go up the equal fixedly connected with fixture block in the outside four corners department of movable cover, the equal fixedly connected with fixed block in the outside four corners department of lower movable cover, the inboard of fixed block has the screw rod through round pin axle swing joint, screw rod and fixture block looks adaptation.

Furthermore, the outer side of the screw rod is connected with an annular block in a sleeved mode, the outer side of the screw rod is connected with a compression nut in a sleeved mode, and the lower surface of the compression nut is attached to the upper surface of the annular block.

Furthermore, the equal fixedly connected with locating piece in both sides of annular piece, the locating piece sets up to "U" shape structure, locating piece and fixture block looks adaptation, the middle part of screw rod is run through and is seted up the bar groove, the middle part fixedly connected with of annular piece and the locating lever of bar groove looks adaptation.

Further, the below of support frame is provided with the adjustable shelf, there is the threaded rod lower surface middle part of support frame through bearing swing joint, the middle part of support frame runs through the thread groove of seting up with threaded rod looks adaptation, the location slide bar of two symmetric distributions of lower fixed surface of support frame is connected with, the upper surface of adjustable shelf runs through the location spout of seting up two and location slide bar looks adaptations, the equal fixedly connected with location stock in lower surface both ends of adjustable shelf.

Furthermore, handles are fixedly connected to the middle portions of the two sides of the upper movable cover and the middle portion of the two sides of the lower movable cover, and two lifting lugs which are symmetrically distributed are fixedly connected to the middle portions of the outer sides of the upper movable cover and the middle portions of the outer sides of the lower movable cover.

The invention has the beneficial effects that: according to the clamping device for underwater welding, the upper shell and the lower shell are arranged and matched to form the closed cavity, so that the pipeline welding position can be sealed, the sealing assemblies are arranged at the two ends of the upper shell and the lower shell and can fill gaps at the connecting positions of the upper shell and the lower shell and the pipeline, meanwhile, the sealing assemblies can play a role in clamping and fixing, the device can be fixed on the outer side of the pipeline, the connecting assemblies are arranged between the upper shell and the lower shell and can fix the positions of the upper shell and the lower shell, underwater welding can be performed in a dry environment, and the welding effect is good.

Drawings

The invention is further illustrated by the following figures and examples.

In the figure: fig. 1 is a schematic view of the overall structure of a clamping device for underwater welding according to the present invention.

FIG. 2 is a schematic side view of a clamping device for underwater welding according to the present invention.

Fig. 3 is a schematic bottom view of an upper housing structure according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a lower housing according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a water guide cover according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a sealing assembly according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of an inner seal ring according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of an external seal ring structure according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a movable frame according to an embodiment of the present invention.

Fig. 10 is a schematic view of a supporting frame according to an embodiment of the present invention.

Fig. 11 is a schematic view of a screw structure provided in an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals: 1. an upper housing; 2. a lower housing; 3. a seal assembly; 4. a connecting assembly; 5. a support assembly; 101. an upper movable cover; 102. an upper connecting cover; 103. a convex strip; 104. a gasket; 105. a fixed cover; 106. a ventilation tube; 107. an air pump; 108. a one-way valve; 109. an exhaust hood; 110. a gas tank; 111. a connecting pipe; 112. an air outlet cover; 113. a lighting lamp panel; 114. an observation window; 201. a lower movable cover; 202. a lower connecting cover; 203. a water guide hood; 204. a water guide hole; 205. a water chute; 206. a water pump; 207. operating gloves; 301. an outer seal ring; 302. an inner seal ring; 303. a slider; 304. a chute; 305. a limiting groove; 306. a limiting block; 307. sealing the sheet; 308. a groove; 401. connecting blocks; 402. connecting columns; 403. a movable frame; 404. an extension plate; 405. a connecting rod; 406. a clamping block; 407. a fixed block; 408. a screw; 409. a ring block; 410. a compression nut; 411. positioning a block; 412. a strip-shaped groove; 413. positioning a rod; 501. a support block; 502. a support frame; 503. a movable frame; 504. a threaded rod; 505. a thread groove; 506. positioning the slide bar; 507. positioning the chute; 508. and (6) positioning the anchor rod.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "connected" or "disposed" to another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship as shown in the figures, which is for convenience in describing the invention and to simplify the description, and that does not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and is not to be construed as limiting the invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment," "in some embodiments," or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As shown in fig. 1 to 11, the clamping device for underwater welding provided by the invention comprises an upper shell 1, a lower shell 2, a sealing assembly 3, a connecting assembly 4 and a supporting assembly 5, wherein the sealing assembly 3 is arranged at both ends of the upper shell 1 and the lower shell 2, the connecting assembly 4 is arranged between the upper shell 1 and the lower shell 2, and the supporting assembly 5 is arranged below the lower shell 2.

Go up casing 1, it includes movable cover 101 to go up casing 1, go up connecting cover 102 on the equal fixedly connected with in both ends of movable cover 101, it sets up to semi-circular structure to go up connecting cover 102, go up the sand grip 103 of the inboard fixedly connected with arc structure of connecting cover 102, the lower surface adhesive connection who goes up movable cover 101 has sealed the pad 104, the middle part of going up movable cover 101 is inlayed and is had fixed cover 105, the equal fixedly connected with scavenging duct 106 in both ends of fixed cover 105, the bottom fixedly connected with of scavenging duct 106 cover that admits air, the top middle part fixedly connected with aspiration pump 107 of going up movable cover 101, the output fixedly connected with check valve 108 of aspiration pump 107, the top fixedly connected with exhaust hood 109 of check valve 108.

Specifically, go up movable cover 101's outside middle part fixedly connected with gas pitcher 110, gas pitcher 110's output fixedly connected with connecting pipe 111, the equal fixedly connected with in both sides middle part of fixed cover 105 goes out the gas pitcher 112, the one end and the play gas pitcher 112 fixed connection of connecting pipe 111, the gas pitcher 110 is internal to be stored with supplementary welded gas, the bottom middle part of fixed cover 105 is inlayed and is had illumination lamp plate 113, it has observation window 114 to inlay in the outside middle part of going up movable cover 101, the material of observation window 114 is toughened glass, aspiration pump 107 sets up to waterproof air pump, the outside of movable cover 201 is inlayed and is had two symmetric distribution's operating gloves 207, operating gloves 207 sets up to withstand voltage gloves, the upper surface of lower movable cover 201 is provided with the sealing washer with sealed 104 looks adaptation.

Lower casing 2, lower casing 2 is including lower movable cover 201, connecting cover 202 under the equal fixedly connected with in both ends of lower movable cover 201, connecting cover 202 sets up to semi-circular structure down, connecting cover 202 and last connecting cover 102 looks adaptation down, inlay in the bottom middle part of lower movable cover 203 has water guide cover 203, a plurality of water guide holes 204 have been seted up to the upper surface of water guide cover 203, guiding gutter 205 has all been seted up on the both sides top of water guide cover 203, the bottom middle part fixedly connected with suction pump 206 of water guide cover 203.

Seal assembly 3, seal assembly 3 includes two symmetric distribution's external seal ring 301 and two symmetric distribution's interior sealing ring 302, interior sealing ring 302 is located external seal ring 301's inside, the outside fixedly connected with slider 303 of interior sealing ring 302, slider 303 sets up to semi-circular structure, the cross-section of slider 303 sets up to "T" shape structure, spout 304 has been seted up to external seal ring 301's inboard, slider 303 is located spout 304, the spacing groove 305 of arc structure is seted up to external seal ring 301's inboard, the outside fixedly connected with stopper 306 of interior sealing ring 302, stopper 306 is located the spacing groove 305, the outside fixedly connected with arc structure's of interior sealing ring 302 sealing fin 307, the recess 308 with sand grip 103 looks adaptation is seted up in external seal ring 301's the outside, recess 308 sets up to the arc structure.

Coupling assembling 4, coupling assembling 4 includes two sets of symmetric distribution's connecting block 401, two sets of connecting blocks 401 are located the one side both ends of movable cover 101 and lower movable cover 201 respectively, one side fixedly connected with spliced pole 402 of connecting block 401, the outside of spliced pole 402 is cup jointed and is connected with movable frame 403, movable frame 403 sets up to the arc structure, the extrados middle part fixedly connected with of movable frame 403 extends board 404, two extend the connecting rod 405 of two symmetric distribution of one side fixedly connected with that board 404 is close to each other.

Specifically, the outer four corners of the movable cover 101 are fixedly connected with clamping blocks 406, the outer four corners of the lower movable cover 201 are fixedly connected with fixing blocks 407, the inner side of the fixing block 407 is movably connected with a screw 408 through a pin, the screw 408 is matched with the clamping blocks 406, the outer side of the screw 408 is connected with an annular block 409 in a sleeved mode, the outer side of the screw 408 is connected with a compression nut 410 in a sleeved mode, the lower surface of the compression nut 410 is attached to the upper surface of the annular block 409, positioning blocks 411 are fixedly connected with the two sides of the annular block 409, the positioning blocks 411 are arranged in a U-shaped structure, the positioning blocks 411 are matched with the clamping blocks 406, a strip-shaped groove 412 is formed in the middle of the screw 408 in a penetrating mode, and a positioning rod 413 matched with the strip-shaped groove 412 is fixedly connected with the middle of the annular block 409.

Supporting component 5, supporting component 5 includes four supporting shoes 501 that are the distribution of rectangular array, four supporting shoes 501 are located the below four corners department of activity cover 201 down respectively, the below of supporting shoe 501 is provided with support frame 502, support frame 502 sets up to "U" shape structure, the bottom swing joint of round pin axle and supporting shoe 501 is passed through on the top of support frame 502, the below of support frame 502 is provided with adjustable shelf 503, there is threaded rod 504 at the lower surface middle part of support frame 502 through bearing swing joint, threaded groove 505 of seting up with threaded rod 504 looks adaptation is run through at the middle part of support frame 502, the lower surface fixed connection of support frame 502 has two symmetric distribution's location slide bar 506, the upper surface of adjustable shelf 503 runs through sets up two location spout 507 with location slide bar 506 looks adaptation, location spout 507 and location slide bar 506 cooperation, make the motion of adjustable shelf 503 more stable, the equal fixedly connected with location stock 508 in lower surface both ends of adjustable shelf 503.

Go up the equal fixedly connected with handle in the middle part of the both sides of movable cover 101 and lower movable cover 201, the setting up of handle has made things convenient for the installation of device and has moved the equal fixedly connected with lug of two symmetric distributions in the middle part in the outside of movable cover 101 and lower movable cover 201, and the setting up of lug has made things convenient for the hoist and mount of device.

The working principle of the invention is as follows:

this device is when installation, install seal assembly 3 in the outside of pipeline at first, position between interior go-between ring 302 and the outer go-between 301 is adjusted, make interior go-between ring 302 rotate to outer go-between 301 inboard, outer go-between 301 and interior go-between 302 constitute the half-circular arc structure this moment, place two outer go-between 301 respectively in the both sides of pipeline, make two outer go-between 301 splice each other, two interior go-between 302 splice each other this moment and constitute circular structure, interior go-between 302 wraps up the pipeline, rotate two outer go-between 301 this moment, make outer go-between 301 rotate in the interior go-between 302 outside, and then make the slider 303 in the interior go-between 302 outside one interior go-between 302 insert in the inboard spout 304 of another outer go-between 301, the position between two outer go-between 301 and two interior go-between 302 is in fixed state this moment, seal assembly 3 is fixed in the outside of pipeline.

Then adjusting the position of the lower shell 2, moving the lower movable cover 201 to the lower part of the pipeline, enabling the lower connecting covers 202 at the two ends of the lower movable cover 201 to be respectively clamped with the two sealing components 3, wrapping a welding tool by using a sealing bag, putting the welding tool into the lower movable cover 201, rotating the threaded rod 504, enabling the threaded rod 504 to be matched with the threaded groove 505, enabling the position between the movable frame 503 and the supporting frame 502 to be changed, adjusting the position of the movable frame 503, enabling the positioning anchor rod 508 at the bottom end of the movable frame 503 to be inserted into the water bottom, and further enabling the lower shell 2 to be supported; the position of casing 1 is gone up in the adjustment for go up casing 1 and rotate around connecting rod 405, and then make last movable cover 101 rotate to the top of lower movable cover 201, finely tune the position of going up movable cover 101 and lower movable cover 201, make the position of going up movable cover 101 and lower movable cover 201 correspond completely.

The position between the upper shell 1 and the lower shell 2 is fixed through the connecting component 4, the screw 408 is pulled, the screw 408 rotates around the fixing block 407, until the screw 408 rotates into the fixture block 406, the compression nut 410 rotates, the compression nut 410 slides outside the screw 408, the compression nut 410 drives the positioning block 411 to move, until the positioning block 411 compresses the fixture block 406, the position between the upper shell 1 and the lower shell 2 is fixed, and a sealed cavity is formed inside the device.

The water suction pump 206 is started, the water suction pump 206 pumps water in the device through the water guide groove 205 and the water guide hole 204, the gas tank 110 is opened, oxygen is injected into the device through the connecting pipe 111 and the gas outlet cover 112 by the gas tank 110, and after the water in the device is completely pumped out, a worker can operate a welding tool in the device through the operation gloves 207, so that the pipeline can be welded.

When the pipeline is welded, the air pump 107 pumps turbid air inside the device caused by welding through the ventilation pipe 106, the turbid air is exhausted out of the device through the check valve 108 and the exhaust hood 109, meanwhile, oxygen in the air tank 110 is injected into the device through the connecting pipe 111 and the exhaust hood 112, the gas output rate of the air tank 110 is consistent with the gas pumping rate of the air pump 107, and the normal operation of welding operation is guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a clamping device for underwater welding which characterized in that: the air intake device comprises an upper shell, a lower shell, a sealing component, a connecting component and a supporting component, wherein the sealing component is arranged at each of two ends of the upper shell and the lower shell, the connecting component is arranged between the upper shell and the lower shell, the supporting component is arranged below the lower shell, the upper shell comprises an upper movable cover, the upper connecting cover is fixedly connected to each of two ends of the upper movable cover, the upper connecting cover is of a semicircular structure, convex strips of an arc structure are fixedly connected to the inner side of the upper connecting cover, a sealing gasket is connected to the lower surface of the upper movable cover in an adhesive manner, a fixing cover is embedded in the middle of the upper movable cover, air intake pipes are fixedly connected to each of two ends of the fixing cover, an air intake cover is fixedly connected to the bottom ends of the air intake pipes, an air pump is fixedly connected to the middle of the top end of the upper movable cover, and a one-way valve is fixedly connected to the output end of the air pump, the top end of the check valve is fixedly connected with an exhaust hood, the middle part of the outer side of the upper movable hood is fixedly connected with a gas tank, the output end of the gas tank is fixedly connected with a connecting pipe, the middle parts of the two sides of the fixed hood are fixedly connected with gas outlet hoods, one end of the connecting pipe is fixedly connected with the gas outlet hoods, the lower shell comprises a lower movable hood, the two ends of the lower movable hood are fixedly connected with lower connecting hoods, the lower connecting hoods are arranged in a semicircular structure and are matched with the upper connecting hoods, the middle part of the bottom end of the lower movable hood is embedded with a water guide hood, the upper surface of the water guide hood is provided with a plurality of water guide holes, the top ends of the two sides of the water guide hood are provided with water guide grooves, the middle part of the bottom end of the water guide hood is fixedly connected with a water suction pump, and the sealing assembly comprises two symmetrically distributed outer sealing rings and two symmetrically distributed inner sealing rings, the utility model discloses a movable cover's structure, including the internal seal ring, coupling assembling includes the connecting block of two sets of symmetric distributions, and is two sets of the connecting block is located movable cover and one side both ends of lower movable cover respectively, one side fixedly connected with spliced pole of connecting block, the outside of spliced pole is cup jointed and is connected with the movable frame, the movable frame sets up to the arc structure, the extrados middle part fixedly connected with extension board of movable frame, two extend the connecting rod of two symmetric distributions of one side fixedly connected with that the board is close to each other, supporting component includes four supporting shoes that are rectangular array and distribute, four the supporting shoe is located the below four corners department of movable cover down respectively, the below of supporting shoe is provided with the support frame, the support frame sets up to "U" shape structure, the bottom swing joint of round pin axle and supporting shoe is passed through on the top of support frame.

2. The clamping device for underwater welding as claimed in claim 1, wherein: the bottom middle part of fixed cover is inlayed and is had the illumination lamp plate, the outside middle part of going up the movable cover is inlayed and is had the observation window, the material of observation window is toughened glass, the aspiration pump sets up to waterproof air pump.

3. The clamping device for underwater welding as claimed in claim 2, wherein: the outside of activity cover is inlayed down and is had two symmetric distribution's operation gloves, the operation gloves sets up to withstand voltage gloves, the upper surface of activity cover is provided with the sealing washer with sealed pad looks adaptation down.

4. The clamping device for underwater welding as claimed in claim 3, wherein: the outer side of the inner sealing ring is fixedly connected with a sliding block, the sliding block is of a semicircular structure, the section of the sliding block is of a T-shaped structure, a sliding groove is formed in the inner side of the outer sealing ring, and the sliding block is located in the sliding groove.

5. The clamping device for underwater welding as recited in claim 4, wherein: the limiting groove of arc structure is seted up to the inboard of external seal ring, the outside fixedly connected with stopper of interior sealing ring, the stopper is located the limiting groove, the gasket of the outside fixedly connected with arc structure of interior sealing ring, the recess with sand grip looks adaptation is seted up in the outside of external seal ring, the recess sets up to the arc structure.

6. The clamping device for underwater welding as claimed in claim 5, wherein: the outer side four corners of the upper movable cover are fixedly connected with clamping blocks, the outer side four corners of the lower movable cover are fixedly connected with fixing blocks, the inner side of each fixing block is movably connected with a screw through a pin shaft, and the screws are matched with the clamping blocks.

7. The clamping device for underwater welding as recited in claim 6, wherein: the outer side of the screw rod is connected with an annular block in a sleeved mode, the outer side of the screw rod is connected with a compression nut in a sleeved mode, and the lower surface of the compression nut is attached to the upper surface of the annular block.

8. The clamping device for underwater welding as claimed in claim 7, wherein: the equal fixedly connected with locating piece in both sides of annular piece, the locating piece sets up to "U" shape structure, locating piece and fixture block looks adaptation, the middle part of screw rod is run through and is seted up the bar groove, the middle part fixedly connected with of annular piece and the locating lever of bar groove looks adaptation.

9. The clamping device for underwater welding of claim 8, wherein: the below of support frame is provided with the adjustable shelf, there is the threaded rod at the lower surface middle part of support frame through bearing swing joint, the middle part of support frame runs through the thread groove of seting up with threaded rod looks adaptation, the location slide bar of two symmetric distributions of lower fixed surface of support frame is connected with, the upper surface of adjustable shelf runs through the location spout of seting up two and location slide bar looks adaptations, the equal fixedly connected with location stock in lower surface both ends of adjustable shelf.

10. The clamping device for underwater welding as claimed in claim 9, wherein: the handles are fixedly connected to the middle portions of the two sides of the upper movable cover and the lower movable cover, and the two lifting lugs which are symmetrically distributed are fixedly connected to the middle portions of the outer sides of the upper movable cover and the lower movable cover.